add check_url to silent_auth test and readme

Author: maxkahan

README.md

@@ -449,6 +449,7 @@ params = {
     ]
 }
 verify_request = verify2.new_request(params)
+check_url = verify_request['check_url'] # URL to continue with the silent auth workflow
 ```
 
 ### Send a verification code with custom options, including a custom code

tests/data/verify2/create_request_silent_auth.json

@@ -0,0 +1,4 @@
+{
+    "request_id": "b3a2f4bd-7bda-4e5e-978a-81514702d2ce",
+    "check_url": "https://api-eu-3.vonage.com/v2/verify/b3a2f4bd-7bda-4e5e-978a-81514702d2ce/silent-auth/redirect"
+}

tests/test_verify2.py

@@ -392,14 +392,18 @@ def test_new_request_silent_auth():
     stub(
         responses.POST,
         'https://api.nexmo.com/v2/verify',
-        fixture_path='verify2/create_request.json',
+        fixture_path='verify2/create_request_silent_auth.json',
         status_code=202,
     )
 
     params = {'brand': 'ACME, Inc', 'workflow': [{'channel': 'silent_auth', 'to': '447700900000'}]}
     verify_request = verify2.new_request(params)
 
-    assert verify_request['request_id'] == 'c11236f4-00bf-4b89-84ba-88b25df97315'
+    assert verify_request['request_id'] == 'b3a2f4bd-7bda-4e5e-978a-81514702d2ce'
+    assert (
+        verify_request['check_url']
+        == 'https://api-eu-3.vonage.com/v2/verify/b3a2f4bd-7bda-4e5e-978a-81514702d2ce/silent-auth/redirect'
+    )
 
 
 @responses.activate